I hesitate to include these pics because they are not that great of examples of,
Bi-Polar Reduction: A Coastal Plains Technology.
The area I collected these artifacts is a stretch of the north side of the Haw River a few miles above where the Haw and Deep Rivers come together and form the Cape Fear River. This confluence can be considered the beginning, or western edge of the Coastal Plain, tho I have not looked to see where that boundary is actually marked on geologic maps.
To the Native American these boundaries, from the Piedmont to the Coastal Plain as well as Mountains, were not just changes in topography but also in physiology. Inherent adaptations had to be made to survive in these different regions which means a necessary change in technologies used.
It was interesting to me to see how much obvious occupation using coastal plain technology and material was in this area. Being so close to sources of good volcanic material they obviously chose to go with what they were accustomed to.
In the coastal plain they can not walk up the nearby hill or mountain and chip away on a good source of rock, because there isn't any. One main source of lithic material in the coastal plain are rounded water worn cobbles found clustered in areas of elevation drop in creeks and rivers. There's all kinds of different grades of material in those cobbles and I suppose you develop an eye for the good stuff.
The rounded cobbles pictured below are poor examples but what I had handy. When "chipping" into a round rock there's one obvious question that comes to mind right off the bat. Where do you begin?
Thinking Bi-Polar Reduction,
You stand that cobble up on one side or end on some anvil type rock and hit the other end with another big rock and instead of smashing it you try and get long spalls or flakes off the sides to make something out of.
The first pic and close-up are of the side with natural worn exterior showing.
And that's it for this drawer!